After my crash when I uninstalled 0.9.4, I re-installed PR1.2 with NSU, downloaded all my apps and installed 0.9.7 and everything works like a charm and really smoothier.
I hope I'll not have other issue with next upgrade

PS 1: I have the same consumption with the same settings as Taviman (except I'm using 2.5G during 10 hours/day except on week-end)
PS 2: No problem with Firefox 12 (from the store) or twitter (the Stock one or Qneptunea which is my favorite)